When you shoot your blank round to scare the BG how will you handle the potential, momentary flash blindness that could occur if this were a night home invasion? You've sacrificed your night vision (at least for a few seconds) without delivering any defensive hit to the invader. That second shot might not be as fast, accurate or easy as you envision.

U.F.O.

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"But today you just read that the man was shot dead
By a gun that didn’t make any noise
But it wasn’t the bullet that laid him to rest was
The low spark of high-heeled boys"
~Traffic - Stevie Winwood~